Effects of Inferior Temporal Lesions on Two Types of Orientation Discrimination in the Macaque Monkey
Effects of Inferior Temporal Lesions on Two Types of Orientation Discrimination in the Macaque Monkey
复制标题
颞下损伤对猕猴两种方向辨别能力的影响
DOI：
10.1111/j.1460-9568.1997.tb01394.x
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发表时间：
1997
影响因子：
3.4
通讯作者：
G. Orban
中科院分区：
文献类型：
--
作者：
R. Vogels;R. Saunders;G. Orban
对横断前脑连合的恒河猴进行了两种不同任务的训练，其中格栅方向是辨别能力。在时间相同-不同的任务中，猴子必须判断两个连续呈现的栅格在方向上是否不同。在识别任务中，我们测量了猴子对格栅方向的判断能力。任一任务的完成既不受单侧前颞叶皮质区病变的影响，也不受同侧大脑半球后颞叶皮质区病变导致的两期颞叶下部(IT)病变的影响。然而，单期损毁另一侧大脑半球的前、后颞叶皮质(IT)，严重干扰了在时间相同的不同任务中的表现，但仅增加了辨认任务中仅有的方向性差异。这表明，IT损伤后的时间比较任务中的损伤不是由于知觉编码缺陷造成的，而是与时间比较本身有关。因此，信息技术涉及到对连续呈现的刺激的时间比较。另一方面，两种不同的IT损伤，每一种都有不同的病史(单一阶段和两个阶段)，行为影响截然不同，这表明成人大脑的可塑性在决定大脑损伤的行为结果方面发挥着重要作用。
Rhesus monkeys with transection of the forebrain commissures were trained in two different tasks in which grating orientation was the discriminandum. In the temporal same—different task, the monkeys had to judge whether or not two successively presented gratings differed in orientation. In the identification task, we measured how well the monkey could judge the orientation of the grating. The performance in any task was affected neither by a unilateral anterior temporal cortical area lesion nor by a subsequent posterior temporal cortical area lesion in the same hemisphere resulting in a two‐stage inferior temporal (IT) lesion. However, a single stage IT (combined anterior and posterior temporal cortical areas) lesion of the other hemisphere severely disrupted the performance in the temporal same‐different task, but only barely increased just noticeable differences in orientation in the identification task. This indicates that the impairment in a temporal comparison task after an IT lesion is not due to a perceptual coding deficit, but is related to the temporal comparison per se. Thus, IT is involved in the temporal comparison of successively presented stimuli. On the other hand, the two IT lesions, each having a different history (single versus two stage) had dramatically different behavioural effects, suggesting an important role for adult brain plasticity in determining the behavioural outcome of a brain lesion.